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Solute-atom segregation is high-angle (002) twist boundaries in dilute Au–Pt alloys

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Abstract

Solute-atom segregation is studied by Monte Carlo simulations for three high-angle symmetrical (002) twist boundaries in Au-1 at. % Pt and Pt-1 at. % Au alloys at T = 850 K. It complements our previous study, that focused mainly on low-angle boundaries in the same alloys. Solute enhancement occurs on the Pt-rich side of the phase diagram, while on the Au-rich side net depletion in solute is observed. Following the trend observed for low-angle boundaries, Au as a solute prefers the structural units of the perfect crystal type, while Pt as a solute is depleted at those sites. The solutc concentration at structural units depends on the planar fraction of those units in the boundary.

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  1. Department of Materials Science and Engineering and Materials Research Center, R. R. McCormick School of Engineering and Applied Science, Northwestern University, Evanston, 60208-3108, Illinois, USA

    D. Udler & D. N. Seidman

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  1. D. Udler
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Udler, D., Seidman, D.N. Solute-atom segregation is high-angle (002) twist boundaries in dilute Au–Pt alloys. Journal of Materials Research 10, 1933–1941 (1995). https://doi.org/10.1557/JMR.1995.1933

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